The ATSUFontFeatureSelector type represents the state (on or off) of a particular feature type. For example, kRequiredLigaturesOnSelector indicates that the ligature feature type is on. You pass the ATSUFontFeatureSelector type to functions that set or clear font feature selectors in a style run. The ATSUFontFeatureSelector type is passed back by functions that obtain font feature selectors in a style run.
typedef Uint16 ATSUFontFeatureSelector;
